﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace S11
{

    class Program
    {
        static void Main(string[] args)
        {
            string a1 =null;
            string a2 = "";
            string a3 = "   ";
            //Console.WriteLine(StringUtil.IsNull(a1));
            //Console.WriteLine(StringUtil.IsNull(a2));
            //Console.WriteLine(StringUtil.IsNull(a3));
            
            int[] arr1 = null;
            
            int[] arr3 = { };
            
            Console.WriteLine(ArrayUtil.Isnull(arr1));
           
            Console.WriteLine(ArrayUtil.Isnull(arr3));
            Console.ReadKey();
        }
    }
}
